Lock Icon on Tool Bar Menu for Apple Macs

I don’t know why this is so buried and why the solution is so hard to find on Google, but here’s how you get the keychain lock icon to show up on your OS top menu bar:

Applications > Utilities > Keychain Access

Inside Keychain Access:

Keychain Access > Preferences (or command + ,) > check “Show keychain status in menu bar”

whew.